The highest resolution of the Optoma PK301 is WVGA (854x480). That's 80% less resolution than a 1080p (1920x1080) multimedia projector, which is the most frequently found resolution.
A WVGA (854x480) projector native resolution is in fact the worst resolution across all projectors of this age and spec.
A DCI 4K (4096 x 2160) projector native resolution is the best resolution across comparable types of projector.
What does "projector native resolution" mean?